問題詳情

4. When butterflies ____the highway, many of them ____by the traffic.
(A) fly across; have been killed
(B) cross; killed
(C) flew across; will be killed
(D) cross; kill

參考答案

答案：A
難度：非常困難0
統計：A(0),B(0),C(1),D(0),E(0)